DE2263993A1 - ELECTRIC THERMOSTATIC REGULATOR AND DEVICE PROVIDED WITH IT - Google Patents

Description

■ -! 'In

Applicant: John Myrddin M ο rga η, ⁱⁿ Arnhem

Priority: none;

Subject: Electric thermostatic controller and with it provided device.

The invention relates in the first place to an electrical one thermostatic regulator.

Such regulators are well known. They are mostly used in household electrical appliances. That is why there are very high demands on it and they are exposed to very severe stress tests. So they need to be used for certain uses, such as electric heated blankets and space heaters, 100,000 to 200,000 and even too can withstand up to 300,000 switchings with good success. Such Exams take a lot of time and you can't do all of them Subject the regulator to such a test before delivering it, since then the risk would arise that the controllers would already be partially worn and in practice the requirements placed on them would not be met could meet in a satisfactory manner. Therefore, in practice, one of each party of the fabricated controllers is used, for example every hundred checked. If this examinee proves to be good, then the whole sub-party from which the examinee was removed is considered to be good. However, as can be easily understood, this has the consequence that there are still one or more less than the number of controllers supplied. good specimens can be found in practice sooner or later stop working. If this happens when the contact is switched off,

40 9 8 29/04 2

2263393

the only consequence of this is that the device equipped with it no longer works wants to work. In many cases, however, the controller does not fall into this category Expose, but by the fact that the regular contacts weld together. In such a case, the heating current continues to flow indefinitely, what can have dangerous consequences and, for example, cause a fire could give.

The invention intends to avoid these dangerous consequences.

According to the invention, this is brought about in that the thermostat controller is connected in series with a thermal switch. This will cause if the theniiostat contact fails for any reason more opens when the temperature rises after the temperature-sensitive element of the circuit breaker has reached its effective temperature, this off switch interrupts the heating circuit so that there is a risk of fire is prevented. The combination can therefore not only improve security but it can also help to meet the high requirements which were previously valid for such devices, can be lowered, while security does not suffer and is even increased can, especially because the off switch can only work once and the controller can no longer be switched on and therefore one with one Apparatus equipped according to the invention can only be put back into operation after the entire combination has been replaced.

The thermal switch is preferably controlled by the thermostat assembled in a common housing. This will force you to do it to replace the whole combination when the switch has taken effect.

The combination is particularly suitable for training as a micro device, whereby the dimensions can be kept particularly small and the secured thermal regulator takes up very little space.

The invention also includes that described above thermal regulator and circuit breaker combination.

The invention is illustrated below with reference to one in the drawing in enlarged Naestab illustrated exemplary embodiment explained in more detail will. In the drawing shows:

Fig. 1 is a plan view of a thermal regulator and switch combination according to the invention, with some located inside the housing located parts are shown in dashed lines,

409829/0423 OW ^ NAL inspected

Fig. 2 is a side view of the combination, in turn some important parts have been indicated by dashed lines.

FIG. 3 shows a cross section along the line III - III in FIG. 2.

Fig. Λ a side view like Fig. 2, but with after the line IV - IV front wall broken away in FIG. 1, and

5 shows a side view with the side wall broken away along the line V - V in FIG.

The drawing shows a combination according to the invention of an electrical thermostat controller with a thermal switch, which is actually designed as a micro device, but has been shown on a larger scale for the sake of clarity. The device has a housing 1 made of plastic which is U-shaped in horizontal cross-section with a curved part 2 and parallel legs and a flat vertical end wall A and a top wall 5 and a bottom wall 6. On the bottom of the housing there is a conical guide recess 7 for a rod 8, which protrudes with the lower end through a hole in the guide recess and in the bottom wall 6 through the bottom of the housing and rests on a bimetallic shell 9 arched downwards. The bottom wall 6 has a recess 10 on the underside, so that the bimetal shell can snap upwards when its surroundings reach a certain temperature. When this happens, the rod 8 is canceled. The upper end of the same lies free under a contact tongue 11 made of resilient conductive metal and which is provided at the free end with a contact 12 which cooperates with a fixed mating contact 13 which is attached to a fixed contact carrier H, which is attached to a fixed contact carrier H by means of a Rivet 15 is fastened to the housing wall 2, which rivet is used at the same time for fastening a connecting tongue 16. The contact tongue 11 is part of a V-shaped contact device, the other leg of which is indicated by 17 and extends along the rear wall U. The V-shaped contact device 11 is fastened by means of a rivet 18 against an elevation 19 on the underside of the upper wall 5 of the Geniuses and lies with the free leg 17 over the upper side of a lateral elevation 20 of the end wall 4> which has the shape of a horizontal shield , the pointed end of which lies under the free end 21 of the resilient contact tongue 17. About the

A09829 / 0423

ORIGINAL INSPHCTED

side of the shield-shaped end wall elevation is also another Contact tongue 22 arranged, which at the flat end of the shield-shaped Elevation has an upwardly extending extension 22a, which rests against the Seitenflachθ of the increase 20 and means a rivet 23 is attached, which rent on the outside of the Housing at the same time a second connection tongue 24 carries. The lower one Contact tongue 22 has at the free end an approximately right-angle bend with which it follows around the tip of the shield-shaped elevation At its free end 21, the upper contact solution 17 is bent downwards can, so that a releasable electrically conductive connection between the V-shaped contact device 11, 17 and the connecting tongue 24 are formed will. This connection is maintained in the closed position by that the lower contact tongue 22 is supported at the free end by a pin 26 which is guided in a bore 27 in a lower lateral elevation 28 of the end wall 4 and which contacts the lower end on one Melt body 29 is supported in a recess 30 in the side Increase 28 has been lodged.

In practice, the end wall 4 is in this case by means of rivets and Grooves 31 made slidable from below. The bottom wall 6 is means the metal cover plate 32, which is flanged with its edges around obliquely protruding lower edges 33 of the upright housing walls. Around To bring the ends 21 and 25 of the contact tongues 17 and 22 into engagement with each other during assembly, the housing is in the top wall 5 with a small bore 34 is provided through which a mounting pin passes can be inserted to press the free end of the contact tongue 17 against the tip of the shield-shaped inner elevation 20 of the housing. After assembly, the bore 34 can be closed with a hardening material.

The device described above operates as follows.

Normally the device is included in the heating circuit of some electrical device and when the device is switched on the current flows through the device via the two connecting tongues 16 and 24 since the contacts 12 and 13 », which form the contacts of the controller part, are normally closed. If the temperature around this Controller becomes too high, the bimetal shell 9 suddenly bends upwards by so that the regulator contacts 12, 13 quickly separated from each other

409829/0423 originally inspected

l'lh -; ^c ) 93

and the current flow stops until the ambient temperature is lowered again enough to snap the regulator back again the bimetal shell to be able to close again. The switch part remains with its contacts 21 and 25 in the closed position. But if the controller part gets through any cause can no longer open, for example because the contacts 12, 13 have welded to one another Rise in the ambient temperature of the melting bodies 29 of the switch-off part melt, whereby the support pin 26 can lower and the switch tongues 17, 22 are cleared and the contact tongues of the switch part can open. After the off switch has worked, the switch part cannot close again because the spring-loaded contact tongues have stretched. To the device To start up again, it is then necessary to replace the entire combination.

The invention is in the above on the basis of an exemplary embodiment described, to which, however, it is not restricted. It is thus possible to use another known circuit breaker design instead of the circuit breaker part to use. The connections can also be used in other ways be designed and, as required, each have a different direction or be designed to be adjustable. The conical guide elevation for the rod of the controller part can also be designed differently as required. Furthermore, the switching mechanism of the circuit breaker can also be formed by a bimetallic strip which, with the insulated upper end, is the lower Off switch tongue 24 supported. You could also ask for the lower support the lower switch tongue 2 £ a small bimetallic shell use, which can snap downwards when the temperature rises too high. It is also possible to design the controller differently to choose and the two parts in a different mutual arrangement combine, the housing seeing, for example, a parallelepiped Take shape. If necessary, the actuating pins 8 and 26 can be omitted, the bimetail shell 9 and the melting body 29 can be made to act directly on the associated contact parts can.

409829/0423 ORIGINAL INSPECTED

Claims (3)

S - Expectations j) Electrical thermostatic regulator, characterized in that that the thermostat controller is connected in series with a thermal switch. 2. Arrangement according to claim 1, characterized in that that the thermal switch and the thermostat controller are assembled in a common housing. 3. Arrangement according to claim 1 or 2, characterized in that the kenz eichnet that it is designed as a micro device. Λ · Device provided with a thermal regulator and switch-off combination according to one or more of the preceding claims. 409829/0423 ORiGJNAL INSPECTEO